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RedHat 9 (Linux i386) - man page for vdprintf (redhat section 3)

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DPRINTF(3)			    Linux Programmer's Manual			       DPRINTF(3)

       dprintf, vdprintf - print to a file descriptor

       #define _GNU_SOURCE
       #include <stdio.h>

       int dprintf(int fd, const char *format, ...);

       int vdprintf(int fd, const char *format, va_list ap);

       The functions dprintf and vdprintf (as found in the glibc2 library) are exact analogues of
       fprintf and vfprintf, except that they output to a file descriptor  fd  instead	of  to	a
       given stream.

       These functions are GNU extensions, not in C or POSIX.  Clearly, the names were badly cho-
       sen.  Many systems (like MacOS) have incompatible functions called dprintf,  usually  some
       debugging version of printf, perhaps with a prototype like

       void dprintf (int level, const char *format, ...);

       where  the  first  parameter  is  a  debugging level (and output is to stderr).	Moreover,
       dprintf (or DPRINTF) is also a popular macro name for a debugging printf.   So,	probably,
       it is better to avoid this function in programs intended to be portable.

       A better name would have been fdprintf.


GNU					    2001-12-18				       DPRINTF(3)
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